Tunnel corrugated steel dual-layer primary lining supporting method and structure

Abstract

The invention relates to a tunnel corrugated steel dual-layer primary lining supporting method and structure. The method comprises the following steps that firstly, the position in front of a tunnel face is subjected to ahead pre-reinforcing; secondly, according to the surrounding rock large-deforming condition, a reserved deforming amount is set, and the tunnel excavated section is determined; thirdly, splicing of first-layer corrugated steel preliminary bracing is carried out; fourthly, the gap between the corrugated steel and the surrounding rock is subjected to backfill grouting filling, and an anchor rod drilling machine is used for constructing a system anchor rod; fifthly, an inverted arch second lining and inverted arch backfill are subjected to cast-in-place operation, a second-layer corrugated steel primary lining assembly joint and a second lining assembly joint are reserved; sixthly, assembly of second-layer corrugated steel preliminary bracing is carried out, and groutingfilling of the gap between the first-layer corrugated steel preliminary bracing and the second-layer corrugated steel preliminary bracing can be finished; seventhly, second lining pouring or assemblyand backfill grouting of a second lining precast pipe piece can be carried out; and eighthly, a road surface, drainage ditches on the two sides and cable ducts on the two sides are constructed. Compared with the prior art, the method has the advantages that full-section rapid mechanical and intelligent building are achieved, and construction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of tunnel support, in particular to a tunnel corrugated steel double-layer primary lining support method and structure. Background technique [0002] Tunnels constructed by traditional drilling and blasting methods under high ground stress surrounding rock conditions use steel or steel arches combined with shotcrete as primary support, often causing intrusions caused by excessive primary support deformation caused by high ground stress release. Due to the characteristics of the steel arch frame combined with the initial support of shotcrete, it is not only difficult to repair the initial support under the condition of large deformation, but also causes great trouble to the later construction of the second lining. Contents of the invention [0003] The object of the present invention is to provide a tunnel corrugated steel double-layer primary lining support method in order to overcome the above-mentioned d...

AI Technical Summary

Problems solved by technology

[0002] Tunnels constructed by traditional drilling and blasting methods under high ground stress surrounding rock conditions use steel or steel arches combined with shotcrete as the initial support, often causing intrusions caused by excessive deformation of the initial support caused by the release of high ground stress

Due to the characteristics of the steel arch frame combined with the shotcrete initial support, it is not only difficult to repair the initial support in the case of large deformation, but also causes great troubles to the second lining construction in the later stage

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